Improvement in portable furnaces



H. J. LING-ENFELTER.

Portable Furnaces.

No. 145,954, I Patented Dec. 30, 1873.

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UNITED STATES PATENT QEEIGE.

HENRY J. LINGENFELTER, QF GLEN, NEW YORK.

IMPROVEMENT IN PORTABLE FURNACES.

Specification forming part of Letters Patent No. 145,954., datedDecember 30, 1873; application filed August 26, 1872.

To all whom it may concern:

Be it known that I, HENRY J. LINGEN- FELTER, of the town of Glen, countyof Montgomery, State of New York, have invented a certain article ofmanufacture, denominated a Supplementary Furnace, and I do herebydeclare that the following is a description thereof, reference being hadtothe accompanying drawings, in which Figure 1 represents a perspectiveview of the furnace, with a part broken away, illustrating theimprovements in the invention. Fig. 2 is a sectional elevation of thesame. Fig. 3 is a vertical view.

My invention relates to a furnace intended to be set on a stove andconnect with the smoke-flue of the same, and consists in a furnace soconstructed that the fire-pot will be surrounded by an airspace arrangedin the sides, provided with inlet-ports and exit-ports, arranged in thesmoke-flue in such a manner that the cold air may be admitted within thesaid air-space, and to have means for escape into the smoke-flue withoutheating the room or escaping over the fire; the object of this inventionbeing to produce a furnace which can be used to heat vessels withoutexcessively warming the room, and in which shavings, chips, or charcoal,or other suitable fuel, may be used.

To enable others skilled in the art to make and use my invention, I willproceed to describe it in reference to the drawings, and the letters ofreference marked thereon, the same letters indicating like parts.

In the drawing, A represents the fire-pot, which may be made of anydesirable form, and of either cast or sheet metal, and, if the latter,it is preferred to have the same lined with any suitable material whichwill prevent its being quickly burned out. B is an air-space,surrounding the whole fire-pot, as shown, which space is formed by thewall of the fire-pot and the jacket 0. a a are inlet-ports, which areintended to permit the entrance of cool air to the space B, and areprovided with dampers b to close the same when desired. D is thesmoke-flue, communicating with the fire-pot A, and may be provided witha damper. o c c are escape-ports made in the smoke-flue D, andcommunicate with the air-space B, to permit the escape of the air as itis heated without its passing over the fire. d is a draft-hole,

provided with a damper, d, as shown.

If desired, the said furnace may be constructed of an oblong form, andmay be pro vided with a partition in the fire-box, so as to secure adivision of the same, and also be provided with a top, which will havetwo potholes, so as to receive two vessels at the same time.

The manner in which this invention is to be operated is as follows: Theapparatus is to be placed on a stove, and the smoke-flue D is to be madeto communicate with the smoke-pipe of the stove, in which stovesmoke-pipe a proper opening is to be made. The fuel, which may be eitherchips or other fuel, is placed in the firebox A, and the dampers opened.After the fire is kindled, the damper (1 may be partially closed, ifdesired. The dampers of the inlet-ports a a are also opened, and thefresh or cool air will be permitted to constantly onter the air-space B,to escape through the ports 0 0 into the smoke-flue D; thence out intothe pipe of the stove, and, in so moving, excessive radiation of heatwill be prevented.

This invention is simple, and will enable a person to heat any vessel tocook, boil, steam, or warm, without excessively heating the room, andwith a small amount of fuel.

Having described my invention, what I claim, and desire to secure byLetters Patent, 1s-

The portable furnace constructed with double walls, with an annularair-space, B, be tween, ports a, for the admission of air to the saidair-space, and ports 0, located in the exitflue D, permitting the heatedair to escape in the said exit-flue without coming in contact with thefire in the fire-chamber, substantially as and for the purpose setforth.

HENRYJ. LINGENFELTER.

Witnesses:

DELAVAN MANNING, GEo. A. TnoMPsoN.

